Aluminium is remarkable for the metal's low density and for its ability to resist corrosion due to the phenomenon of passivation.
Lead is used in building construction, lead-acid batteries, bullets and shot, weights, as part of solders, pewters, fusible alloys, and as a radiation shield.
The metal and its alloys have been used for thousands of years. Pure copper is soft and malleable; a freshly exposed surface has a reddish-orange color.
Plastics are typically organic polymers of high molecular mass, but they often contain other substances. They are usually synthetic, most commonly derived from petrochemicals, but many are partially natural.
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